Cold hardiness & minimum temperature

Is American Cranberry (Vaccinium macrocarpon)cold hardy? Hardiness zone & min temp

Also called large cranberry, American cranberry.

More about american cranberry

About American Cranberry

Vaccinium macrocarpon · also called large cranberry, American cranberry · edible

American cranberry is a low, creeping, evergreen bog plant grown commercially for its tart red berries used in juice and sauce. It needs permanently moist, strongly acidic, sandy peat and full sun. Wiry trailing runners root as they spread, while short upright shoots carry the pink flowers and fruit through autumn harvest.

Cold limit: USDA 2-7 · RHS H7 (-30 to 28°C)

What american cranberry's hardiness rating actually means

Yes — american cranberry is genuinely cold hardy. Rated RHS H7 and USDA 2-7, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. On the US scale that maps to USDA 2-7 — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

Minimum survivable temperature is roughly below about −20 °C. American Cranberry is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for american cranberry as it gets too cold:

It tolerates winter lows to about −20 °C once established.
Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root.
First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.

Can american cranberry go outside or overwinter — and where?

Plant it out within USDA 2-7 and it overwinters with little or no help.
It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy.
The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when american cranberry can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

American Cranberry hardiness — frequently asked questions

Is american cranberry cold hardy?

Yes — american cranberry is genuinely cold hardy. Rated RHS H7 and USDA 2-7, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. American Cranberry is hardy across USDA 2-7; it belongs in the ground or a frost-proof container, not on a windowsill, and many types actively need a cold winter to perform.

What is the minimum temperature american cranberry can survive?

Minimum survivable temperature is roughly below about −20 °C. American Cranberry is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is american cranberry?

American Cranberry is rated USDA 2-7 and RHS H7 — Hardy in the severest European continental winters.

Can american cranberry survive winter outside?

Plant it out within USDA 2-7 and it overwinters with little or no help. It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy. The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

What happens to american cranberry below its minimum temperature?

It tolerates winter lows to about −20 °C once established. Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root. First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.